Spectroscopic and laser properties have been characterized for Nd 3ϩ in LaSc 3 ͑BO 3 ͒ 4 . The Judd-Ofelt analysis has been applied to the measured room temperature absorption spectrum to determine the radiative decay rates and branching ratios of Nd 3ϩ transitions from the 4 F 3/2 metastable state to the 4 I J lower-lying manifolds. The parameters ⍀ 2 , ⍀ 4 , and ⍀ 6 are larger than those reported for Nd 3ϩ in other laser host crystals. The value of ⍀ 4 /⍀ 6 is approximately 3.0 times larger than that of Nd 3ϩ in yttrium-aluminum-garnet ͑YAG͒ and about 1.4 times larger than that of Nd 3ϩ in the  phase of LaSc 3 ͑BO 3 ͒ reported recently. The measured room temperature fluorescence lifetime of the 4 F 3/2 → 4 I 11/2 transition is 150 s, while the Judd-Ofelt analysis predicts a radiative lifetime for the 4 F 3/2 state to be 249 s, resulting in the fluorescence quantum efficiency of 60%. The emission cross sections of the 4 F 3/2 → 4 I 11/2 and 4 F 3/2 → 4 I 13/2 intermanifold transitions have been also determined at room temperature. Finally, these results are compared with those of the standard laser material Nd 3ϩ :YAG.
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